Steam-heating apparatus



(No Model.) J. AGATE.

STEAM HEATING APPARATUS. No. 411.631. Patented Sept. 24,1889.

a. PETERS. mAm n nr. Walhingtm. n. c.

UNITED STATES PATENT OFFICE.

JOHN AGATE, OF PITTSFORD, NEVV YORK.

STEAM-H EATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 411,631, datedSeptember 24, 1889.

Application filed March 27, 1889 gerial No. 304,989- (No model.) I

To all whom it may concern.-

Be it known that 1, JOHN AGATE, a citizen of the United States, residingat Pittsford, in the county of Monroe, in the State of New York, haveinvented certain Improvements in Steam-Heating Apparatus, of which thefollowing is a specification, reference being bad to the accompanyingdrawings.

- My invention relates to an improvement in steam-heating apparatus,having for its object the utilization of a'portion of the exhaust-steamfrom an ordinary steam-engine, said portion of the exhaust being takenfrom the cylinder by an improved construction of the valve mechanism ator nearly at the termination of the power strokes of the piston.

My invention is fully described and illustrated in the followingspecification and accompanying drawings and the novel features thereofspecified in the claims annexed to the said specification.

In the accompanying drawings, representing a steam-engine and heatingapparatus adapted to carrying myinyention into practical effect, Figure1 is a longitudinal section through the steam-cylinder and valve-chest.Fig. 2 is a transverse section of the same on the line 2 2, Fig. 1. Fig.3 is a side elevation of the steam-chest and ports, partially insection. Fig. 4 is an inverted view showing the exhaust-passages at thebottom of the cylinder.

In the accompanying drawings, A is a steamcylinder, B the piston, and Cthe piston-rod, all of which are of any ordinary construction andconnected to operate a crank-shaft in any usual or preferred manner.

E is the steam-chest; F, the inletisteanbpassage, and G theexhaust-passage for the bulk of the steam. The steam-chest isconstructed in any ordinary way, its walls being cast with the cylinderand provided with the cover H, or constructed in any other suitable way.

I is the valve-slide, located within the steamchest and operated from aneccentric on the crank-shaft by the valve-rod J and suitableconnections.

K K are the steam-passages between the steam-chest and the cylinder.

As indicated in Fig. 1, the exhaust-passage is divided and provided withthe two ports L L, opening into the steam -chest.

N N are supplementary exhaust-ports located immediately inside of themain exhaust- .ports LL ,and connected by suitable cored passages(indicated by the dotted lines 0 O in and the latter about equal inwidth to the distance between ports N N, while each month of the passageS is about equal to a port R or B. As represented in Fig. 1, theslide-valve is supposed to be moving to the left at the end of thepiston-stroke and live steam is about to be admitted at port R. The portN has just permitted the escape of steam not entirely expended and isabout to be closed prior to the entire opening of exhaust L. Theconstruction is such and so proportioned and arranged that a portion ofthe exhauststeam can be separated while yet it has some pressure and anavailable amount of heat and conducted to the radiator, and theremainder of the exhaust-steam after its expansion subsequently forcedout of the port L, port N being at this time closed. This specialoperation is characteristic of my improvement upon prior devices, whicheither failed to divide the exhauststeam or divided it aft-er escapefrom the valve, and therefore after too great expansion, or failedentirely to utilize exhauststeam before its complete expansion.

The operation of my invention will be understood from an examination ofthe longitudinal section, Fig. l, in which the piston 13 is representedat the right-hand end of its stroke and live steam is about to enter thecylinder through the passage K as soon as plementary exhaustport N andpartially through the main exhaust-port L. The further movement of thevalve closes the supplementary exhaust-port N, and the escape of thegreat bulk of the steam from the cylinder takes place through the mainexhaustport L and the exhaust-passage G. A similar operation takes placeat the other end of ,the stroke. The check-valve T is inserted in pipeU, leading fromthe supplementary exhaust-passage P to the heater Q,which check valve may be provided with the threaded stem W and ahand-wheel V, by which the 1 amount of its opening is regulated so as tovary the quantity of the steam transferred to v the heater Q or to shutoff entirely the flow of steam thereto. y

In order to provide for warming the radiator when the engine is notrunning, I connect it with the boiler directly by the pipe X, providedwith throttle-Valve Y.

It is obvious that by varying the position and dimensions of thesupplementary exhaust-ports N N relatively to the main ex haust-ports LL or the movement of the valve the quantity of steam taken from thecylinder at each stroke may be controlled. The pressure of the steam inthe heater will hold the check-valve T closed when it exceeds thepressure in the supplementary exhaust-passages, and by limiting theopening of the check-valve any desired amount of steam may be admittedto the heater.

It is obvious that many changes and modifi'cations may be made in myinvention without departing from the leading principle thereof, whichconsists in removing or discharging a certainamount of the steam at ornear the end of the power-stroke, when the re- The steam-cylinder andpiston and steam-chest provided with passages K K and with thesupplementary exhaust-ports N N, located between said passages, and theexhaust-ports L L, the slide-valve 1,. having all said passages andports during the admission of steam to the cylinder, and then uponsuitable movement to uncover first a supplementary port, and then tocover the same and uncover an exhaust-port 'L or L all in combinationwith a radiator and a pipe having a check-valve communicating with saidsupplementary ports and with the radiator, substantially as set forth.

Witnesses:

GEO. B. SELDEN, (J. M. HEFFRON.

JOHN AGATE,

